Possible Clues:

• Couched in deceit
• Said to dismiss deceitful cur keeping head low?
• Telling 'porkies'
• Prone to be 16 across
• Not standing for dishonest behaviour
• 'Falsely ingenious' might cover it
• Full of baloney
• Prone to be not 25 down
• Fish caught in beginning of year? On the contrary -- whoppers being invented
• More than misleading